... current/voltage , phase sequence protection 3) MCU control, no brush, no wea ST Step-down transformer ... transformer,electric transformer,JBK Machine Tool Control Transformer, Transformer,BKC,JBKDG & SGPower Transformer,Dry type transformer,Three-phase Dry-type Power Transformer,Transformer,SG,DG DG and SG series ... less than 500V.All the input and output voltage,connection group and capacity of tapped ...